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一種應(yīng)用于5G非授權(quán)頻段通信的低時延隨機接入機制

朱正航,  賈建鑫,  酈振紅,  錢驊,  康凱

朱正航, 賈建鑫, 酈振紅, 錢驊, 康凱. 一種應(yīng)用于5G非授權(quán)頻段通信的低時延隨機接入機制[J]. 電子與信息學(xué)報, 2020, 42(11): 2680-2688. doi: 10.11999/JEIT190515
引用本文: 朱正航, 賈建鑫, 酈振紅, 錢驊, 康凱. 一種應(yīng)用于5G非授權(quán)頻段通信的低時延隨機接入機制[J]. 電子與信息學(xué)報, 2020, 42(11): 2680-2688. doi: 10.11999/JEIT190515
Zhenghang ZHU, Jianxin JIA, Zhenhong LI, Hua QIAN, Kai KANG. A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum[J]. Journal of Electronics & Information Technology, 2020, 42(11): 2680-2688. doi: 10.11999/JEIT190515
Citation: Zhenghang ZHU, Jianxin JIA, Zhenhong LI, Hua QIAN, Kai KANG. A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum[J]. Journal of Electronics & Information Technology, 2020, 42(11): 2680-2688. doi: 10.11999/JEIT190515

一種應(yīng)用于5G非授權(quán)頻段通信的低時延隨機接入機制

doi: 10.11999/JEIT190515 cstr: 32379.14.JEIT190515
  • 1.

    中國科學(xué)院上海高等研究院 上海 201210

  • 2.

    TCL通訊科技控股有限公司 深圳 518057

基金項目: 國家科技重大專項(2017ZX03001019)；國家自然科學(xué)基金(61671436)
詳細信息
    作者簡介:

    朱正航：男，1982年生，高級工程師，研究方向為5G、軟件定義無線電

    賈建鑫：男，1988年生，助理工程師，研究方向為LTE與5G系統(tǒng)

    酈振紅：女，1977年生，博士，研究方向為5G標準化

    錢驊：男，1976年生，研究員，博士生導(dǎo)師，研究方向為無線通信、非線性信號處理、大數(shù)據(jù)信號處理

    康凱：男，1977年生，正高級工程師，碩士生導(dǎo)師，研究方向為下一代無線通信系統(tǒng)、5G、Wi-Fi系統(tǒng)

    通訊作者:

    康凱　kangk@sari.ac.cn

  • 中圖分類號: TN929.5

A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum

  • 1.

    Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

  • 2.

    TCL Communication Technology Holdings Limited Company, Shenzhen 518057, China

Funds: The National Science and Technology Major Project (2017ZX03001019), The National Natural Science Foundation of China (61671436)
  • 摘要: 針對5G非授權(quán)頻段通信(NR-U)場景，該文提出一種新型的低時延隨機接入機制。該機制分別在隨機接入回復(fù)窗口(RARW)與競爭窗口中加入了信道空閑計時器，來減少UE因在非授權(quán)頻段進行競爭接入所引起的時延；此外該機制還加入了請求發(fā)送/允許發(fā)送機制，來解決隱藏節(jié)點對隨機接入過程的影響。該機制可降低傳統(tǒng)機制中由于未考慮非授權(quán)頻段特性及隱藏節(jié)點問題所引起的隨機接入時延問題。該文首先對NR-U場景中的傳統(tǒng)隨機接入機制進行分析并進行問題定位；其次，提出新型隨機接入機制的網(wǎng)絡(luò)實體交互流程，建立新型機制與傳統(tǒng)機制中的網(wǎng)絡(luò)實體交互時序模型；最后以數(shù)學(xué)推導(dǎo)和仿真的方法對新型機制與傳統(tǒng)機制進行對比評估，相關(guān)結(jié)果顯示出新型機制在平均耗時方面的優(yōu)勢。
    Abstract: For the 5G New Radio in Unlicensed (NR-U) spectrum scenario, a novel random access mechanism is proposed, which first adds the channel idle timer in Random Access Response Window (RARW) and contention resolution window to reduce the accessing delay caused by the contention-based accessing and employs the Request To Send/Clear To Send (RTS /CTS) mechanism to address the hidden node issue. The mechanism can alleviate the latency incurred by the legacy mechanism which did not consider the intrinsic attribute of unlicensed band and the hidden node problem. Specifically, the legacy random access mechanism applied to NR-U is analyzed. Then, the detailed elaboration of the network entity interaction sequence defined in novel mechanism is proposed. Finally, the performance evaluation processes are carried out in the way of mathematical modeling and experimental simulation, and the analysis result demonstrates that the novel scheme outperforms the benchmark one in the respect of the average random access delay.
    • HTML全文

  • 圖  1  傳統(tǒng)隨機接入機制的時序交互圖

    圖  2  應(yīng)用于NR-U的傳統(tǒng)隨機接入機制的狀態(tài)轉(zhuǎn)移圖

    圖  3  考慮M個競爭節(jié)點的新型隨機接入機制時序圖

    圖  4  隱藏節(jié)點場景下的新型隨機接入機制時序圖

    圖  5  新型隨機接入機制狀態(tài)轉(zhuǎn)移圖

    圖  6  滿足T0-7(2)<T0-7(1)時(T2rx2,T2rx4)的取值范圍

    圖  7  考慮隱藏節(jié)點時各隨機接入方法平均耗時比較

    圖  8  滿足T0-7(3)<T0-7(1)時(T2rx2,T2rx4)的取值范圍

    圖  9  滿足T0-7(3)<T0-7(2)時(Trx2,Trx4)的取值范圍

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    DE ANDRADE T P C, ASTUDILLO C A, SEKIJIMA L R, et al. The random access procedure in long term evolution networks for the Internet of things[J]. IEEE Communications Magazine, 2017, 55(3): 124–131. doi: 10.1109/MCOM.2017.1600555CM
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  • 被引次數(shù): 0
出版歷程
  • 收稿日期:  2019-07-10
  • 修回日期:  2020-03-07
  • 網(wǎng)絡(luò)出版日期:  2020-04-02
  • 刊出日期:  2020-11-16

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